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On 01/06/2015 12:34, Dmitry Monakhov wrote: > Yes. Improvement is not huge, but it can be detected for old qemu > unpatched kernel: 728 MiB/sec ± 20Mb patched kernel : 748 MiB/sec > ± 10Mb Ok, so about 3-4%. What does the blktrace look like with a patched kernel, and what is the performance with old QEMU? Paolo > IMHO patch is not sufficient. We have to correct bio construction > inside direct-io code. I'll be back with the patch.
